Synonyms for

Invalid

Verb / ˈɪnvʌlʌd / / ˈɪnvʌlɪd / / ˌɪˈnvælʌd / Another word for invalid — explore alternatives below. For syllable breakdowns and pronunciation, see this word on Syllablesworld.

Definition

not valid or legally binding; not acceptable

Synonyms & similar words

disable shutin valid incapacitate handicap void null worthless unacceptable unlawful illegitimate unenforceable false fake phony spurious counterfeit devoid empty unsubstantiated unsupported unsound fallacious erroneous

Synonyms by register

Formal

unsound fallacious erroneous defective

Informal

no good wonky bogus lame

Literary

null void untenable

Antonyms

valid sound logical correct legitimate acceptable reasonable

Common collocations

  • invalid argument
  • invalid data
  • invalid input
  • invalid address
  • invalid code
  • invalid passport
  • invalid request

Word family

noun invalidity
adjective invalid
adverb invalided

Usage note

Often used in technical or legal contexts to describe something that is not legally or logically acceptable. Can also refer to someone who is ill or disabled, though this usage is becoming less common due to its potentially offensive connotations.

Example sentences

  1. The teacher marked the exam answers invalid because they were not filled in correctly.
  2. The coupon was invalid because it had expired.
  3. The contract was declared invalid because it was not signed by both parties.
  4. The doctor said that the patient was an invalid and needed bed rest.
  5. The invalid had to use a wheelchair to get around.

Quotes

  • A valid argument is made by a valid person; an invalid argument is made by an invalid person. - Robert Green Ingersoll
  • A belief is not merely an idea the mind possesses; it is an idea that possesses the mind. - Robert Oxton Bolt
  • The best argument against democracy is a five-minute conversation with the average voter. - Winston Churchill

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